Cranking issue?

batmanfc · 11-14-2009, 02:43 PM

Just put a new engine in my car. It's an s5 TII engine with the emissions removed. When it is cold and hasn't been started that day it will crank and die instantly for 4 or 5 tries. Once the 5 try I can get it to stay running but I have to hold it at about 2500 or 3000 rpms to get it to keep idle and it has a miss for about 1 minute and then will idle and run fine and very strong. What could cause this?

Whizbang · 11-14-2009, 04:43 PM

well if you removed all the emissions did you remove the thermowax controls on the throttle body?

batmanfc · 11-14-2009, 05:19 PM

Thermowax controls?

Whizbang · 11-14-2009, 05:23 PM

there is supposed to be a coolant line off the engine block to the throttle body, then it returns back to the water pump. This flowed coolant to a thing called the thermowax, which, while cold held the throttle open and as the coolant warmed, let off the throttle plates. if its removed (common for people to do when removing emissions not knowing what it fully is) your cold start blows.

batmanfc · 11-14-2009, 09:06 PM

Oh ok. Yea I don't believe it is there haha. Where would the line be exactly?

Whizbang · 11-14-2009, 09:09 PM

well the coolant line comes off the rear iron to the throttle body if it was there. There is a nipple extending straight up on top of the engine.

Whizbang · 11-14-2009, 09:10 PM

i would also double check for vacuum leaks.

batmanfc · 11-14-2009, 09:35 PM

Yea I checked all the vac leaks and they are ok. Is the nipple on the side of the rear iron or on the top?

Whizbang · 11-14-2009, 09:38 PM

on top. its rather large (since it flowed coolant).

its around there on most 13bs

batmanfc · 11-14-2009, 09:57 PM

Ok gotcha. I'm about postivie it isn't. I'll check it and fix it. That will help with cold start?

Whizbang · 11-14-2009, 10:01 PM

depends if you have the equipment connected to the throttle body or not. can you get a picture of your TB?

batmanfc · 11-15-2009, 10:11 PM

Yea I can try to get it tomorrow if I get off of work in time.

batmanfc · 11-21-2009, 07:01 PM

Sorry I have been out of town and still haven't had a chance to take a picture. I will get one as soon as possible.

11-14-2009, 02:43 PM	#1
batmanfc Rotarys Ruin Lives Join Date: Aug 2009 Location: Wise, VA Posts: 66 Rep Power: 16	Cranking issue? Just put a new engine in my car. It's an s5 TII engine with the emissions removed. When it is cold and hasn't been started that day it will crank and die instantly for 4 or 5 tries. Once the 5 try I can get it to stay running but I have to hold it at about 2500 or 3000 rpms to get it to keep idle and it has a miss for about 1 minute and then will idle and run fine and very strong. What could cause this? __________________ '88 Turbo II '89 GXL '07 Cobalt: DD

11-14-2009, 04:43 PM	#2
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	well if you removed all the emissions did you remove the thermowax controls on the throttle body? __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-14-2009, 05:19 PM	#3
batmanfc Rotarys Ruin Lives Join Date: Aug 2009 Location: Wise, VA Posts: 66 Rep Power: 16	Thermowax controls? __________________ '88 Turbo II '89 GXL '07 Cobalt: DD

11-14-2009, 05:23 PM	#4
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	there is supposed to be a coolant line off the engine block to the throttle body, then it returns back to the water pump. This flowed coolant to a thing called the thermowax, which, while cold held the throttle open and as the coolant warmed, let off the throttle plates. if its removed (common for people to do when removing emissions not knowing what it fully is) your cold start blows. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-14-2009, 09:06 PM	#5
batmanfc Rotarys Ruin Lives Join Date: Aug 2009 Location: Wise, VA Posts: 66 Rep Power: 16	Oh ok. Yea I don't believe it is there haha. Where would the line be exactly? __________________ '88 Turbo II '89 GXL '07 Cobalt: DD

11-14-2009, 09:09 PM	#6
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	well the coolant line comes off the rear iron to the throttle body if it was there. There is a nipple extending straight up on top of the engine. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-14-2009, 09:10 PM	#7
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	i would also double check for vacuum leaks. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-14-2009, 09:35 PM	#8
batmanfc Rotarys Ruin Lives Join Date: Aug 2009 Location: Wise, VA Posts: 66 Rep Power: 16	Yea I checked all the vac leaks and they are ok. Is the nipple on the side of the rear iron or on the top? __________________ '88 Turbo II '89 GXL '07 Cobalt: DD

11-14-2009, 09:38 PM	#9
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	on top. its rather large (since it flowed coolant). its around there on most 13bs __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-14-2009, 09:57 PM	#10
batmanfc Rotarys Ruin Lives Join Date: Aug 2009 Location: Wise, VA Posts: 66 Rep Power: 16	Ok gotcha. I'm about postivie it isn't. I'll check it and fix it. That will help with cold start? __________________ '88 Turbo II '89 GXL '07 Cobalt: DD

11-14-2009, 10:01 PM	#11
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 20	depends if you have the equipment connected to the throttle body or not. can you get a picture of your TB? __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-15-2009, 10:11 PM	#12
batmanfc Rotarys Ruin Lives Join Date: Aug 2009 Location: Wise, VA Posts: 66 Rep Power: 16	Yea I can try to get it tomorrow if I get off of work in time. __________________ '88 Turbo II '89 GXL '07 Cobalt: DD

11-21-2009, 07:01 PM	#13
batmanfc Rotarys Ruin Lives Join Date: Aug 2009 Location: Wise, VA Posts: 66 Rep Power: 16	Sorry I have been out of town and still haven't had a chance to take a picture. I will get one as soon as possible. __________________ '88 Turbo II '89 GXL '07 Cobalt: DD